book Maths Puzzle Numerical Ability

I have $100 to purchase 100 animals. Their cost is.....

Chickens = $0.50
Goats = $3.50
Sheep = $10.00

How many of each animal is purchased to reach the 100 animals required

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book Other Question

Find three consecutive even integers such that 3 times the sum of the first two is 48 less than the third. n+13=-12